Utilizing exhaust-steam



(No ModeL) H. T. LITOH 'FIELD 86 1). RENSHAW.

UTILIZING EXHAUST STEAM.

616264.466. Patented Sept. 19. 1882.

Nrrnn, STATES PATENT FFICE.

HARVEY T. LITGHFIELD, OF HULL, AND DAVID RENSHAW, OF GOHASSET,MASSACHUSETTS.

UTILIZING EXHAUST-STEAM.

SPECIFICATION forming part of Letters Patent No. 264,466, datedSeptember 19, 1882. Application filed January 7, 1882. [No model.)

To all whom t't may concern:

Be it known that we, HARVEY T. LITOH FIELD, of Hull, in the county ofPlymouth and State of Massachusetts, and DAVID RENSHAW,

of Uohasset, in the county ofNorfolk and State of Massachusetts, haveinvented certain new and useful Improvementsin Utilizing Exhaust- Steam;and we do hereby declare that thefollowing is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and usethe same, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, which form a part of this 1 specification.

This invention relates to a general system adapted by us for utilizingthe exhaust of engines, and for which applications have been filed inthe United States Patent Office. The present invention, however, moreparticularly relates to applications numbered, respectively,

30,277 and 39,590 of serial nnmbersot' applications filed. All theseapplications bear aclose resemblance at first sight; but upon a closerand more studied examination it will be perceived that a differentmethod is involved in each individual case, although the same generalprinciple underlies the whole system. We will not, therefore, enter verylargely upon the general subject, as it has been treated in our formerapplications, but will confine ourselves to the present construction andarrangement and mode of operation.

The object of our invention is therefore to 5 simplify the apparatus,lessen the possibility of leakage, and utilize the principle more fullyby bringing under control the various elements of its construction.

To this end, therefore, it consists in the pro- 40 cess herein describedof forcing the exhaust of an engine into the boiler from which it wastaken in a live state. by means of ahot-water jet pump or pumps, and ajet of thelive steam from said boiler, without the interposition of 5intermediatemechanism less the conduit-connections.

it consists, secondly, in the adaptation of the same instrumentalities,only, should it be preferred, we add a superheater whose plane will belower than the entrance of the exhaustpipe to the boiler, for thereasonthat the superheated steam has a continuous rising path, which ina measure utilizes the difference of specific gravity between the liveand superheated steam. The apparatuswill, however, accomplish itspurpose without said super heater.

It further consists, by the means alluded to, in establishing acirculation under pressure from the upper portion or steam-space of aworking boiler to the lower portion or waterbody of said boiler, as willbe hereinafter described, so as to overcome the thermal pressure of suchboiler and utilize the force of the dry-steam jet from the boiler,either superheated or not, in connection with the hot-water jet of thepump or pumps. Two of the methodsone a modified one-to which ourinvention is adapted are illustrated on the sheet of drawings hereuntoappended, whereon- Figure l is a front elevation of ourimprovedapparatus. Fig. 2 is a side elevation of the boiler, and a portion ofthe pipes being in longitudinal section.

In Fig. 1, A represents an ordinary boiler, B the superheater, and (Jthe engine; D, the pumps, which may be either single or double,according to requirements. aa is the pipe which conveys steam from theboiler to the lower portion of the superheater, and b b the pipe thatconducts the superheated steam to the exhaust-pipe c, and,in conjunctionwith the hot-waterjet-pipe cl from the pump, the exhaust is readilyforced into the boiler against its own pressure. The velocity of thesuperheated steam, the non-elastic nature of water, and the affinity thesteam has for the water, all combine to produce this result. Steam fromthe boiler itself and the force of the hotwater jet from the pump wouldproduce the 0 same result, as will be hereinafter described. a a is thesteam-supply pipe to engine,and a supply to working pump-cylinder. V4;is the pump-cylinder exhaust, andj the conduitleadingfroin water-spaceot' the boiler to the pump 9 proper. Having special reference to Fig. 2,A is the boiler, B the engine, and C the pump. The

superheater in this instance is dispensed with, as before stated, and,instead of taking a jet of dry steam from a superheater, we take it fromthe steam-space of the boiler through pipe m.

The operation of our method, as shown by Fig. 2, is as follows: Steambeing supplied through pipe a to the engine, it exhausts through pipe g.Within this pipe 9 we preferably locate an injecting-nozzle, s, suppliedwith steam direct from the boiler,with its open end toward the boiler.Into and through the back of this nozzle we introduce the hot-waternozzle or jet-pipe d. The engine and pump being started simultaneouslywith the livesteam jet from the boiler, and all the currents being inthe same direction, as shown by the arrow, toward the boiler, thecombined body is forced into the water-body of the boiler. The force ofthe live-steam jet and theforced solid jet of water from the pumpreadily overcome the pressure in the boiler, and thus an active andpositive circulation of the water is maintained and the exhaust fullyutilized, and consequently great economy of fuel and water is theresult. The operation of the pump is the same as that shown in Fig. 1.

It will be evident that the pipes may be placed in different positionswithout in any manner modifying our invention. Therefore the exhaust ofengines, consisting essentially of a forced hot-water jet united withdry or superheated steam, said steam and water being taken from onecommon source, and with the said exhaust forced into the water-body ofthe same boiler from which they were taken, substantially in the mannerset forth and described.

2. The method herein described of utilizing the exhaust of engines,consisting of the livesteam pipe, the forced hot-water jet-pipe, theexhaust-pipe, the pipes on and d, uniting and terminating in a nozzlecommon to both, for forcing the united currents into the boiler fromwhich they were taken, in the manner set forth.

In testimony that we claim the foregoing as our own we atfix oursignatures in presence of twowitnesses.

HARVEY 'l. LITOHFIELD. 'DAVID RENSHAW. Witnesses:

WILLIAM BRECK, S. D. WILLIAMS.

